I am not able to send messages to some people who are not in my friend list, while I am able to send messages to many others. Why is it?
I am particularly interested in sending message to a particular individual, but I am not able to. He is not in my friend list and also we do not have any friends in common. Why am I not able to send messages?
At first I thought that it must be because of some settings, but I have just checked all the settings and I am unable to find anything. What's wrong?